无法将selectonHandler添加到Gwt中的TabPanel

Question

SelectionHandler<Widget> handler = new SelectionHandler<Widget>() {
     @Override
     public void onSelection(SelectionEvent<Widget> event) {
         TabPanel panel = (TabPanel) event.getSource();
         Widget w = event.getSelectedItem();
     }
};
TabPanel content = new TabPanel();
content.addSelectionHandler(handler);
content.add(vpanel, "Normal");

widget = new VerticalPanel();
widget.setSpacing(10);
widget.add(content);

  

addSelectionHandler com.google.gwt.event.logical.shared.SelectionHandler> java.lang.Integer＆gt;无法应用于com.google.gwt.event.logical.shared.SelectionHandler

Answer 1

SelectionHandler必须是Integer类型，而不是Widget（请参阅here）。它应该是这样的：

TabPanel panel = ...;

panel.addSelectionHandler(new SelectionHandler<Integer>()
{
    @Override
    public void onSelection(SelectionEvent<Integer> event)
    {

    }
});

或

TabPanel panel = ...;

SelectionHandler<Integer> handler = new SelectionHandler<Integer>()
{
    @Override
    public void onSelection(SelectionEvent<Integer> event)
    {

    }
};

panel.addSelectionHandler(handler);